Half of what arrives as shoulder pain is not coming from the shoulder

TELLING THEM APART / SHOULDER OR CERVICAL SPINE

The shoulder and the cervical spine refer into each other’s territory, which is why this is one of the most commonly misattributed problems in musculoskeletal medicine — and why people get a shoulder injection that does nothing, twice.

Why they are so easily confused

The shoulder girdle is supplied largely from C5 and C6. A cervical root irritated at those levels refers into exactly the region a rotator cuff occupies. Cervical facet joints refer in recognizable maps that cover the scapula and the upper arm. And both problems are worse at night, both are worse overhead, and both are common in the same age group.

Add the imaging trap: rotator cuff tears are extremely common in people with no shoulder symptoms at all, and cervical degeneration is close to universal past middle age. Scan either structure and you will find something. Finding something is not the same as finding the cause.

What points to the shoulder

• Pain reproduced by moving the arm while the neck stays still
• A painful arc through abduction, and pain on resisted testing of specific cuff tendons
• Tenderness localized to the joint or the tendon insertion
• Pain that stops around the elbow and does not travel into the hand
• Night pain lying on that side specifically

What points to the neck

• Pain reproduced by neck movement, particularly extension and rotation toward the side
• Pain traveling past the elbow into the forearm or hand
• Any numbness, tingling or weakness in a dermatomal or myotomal pattern
• Relief with the hand placed on top of the head — the shoulder abduction relief sign
• A shoulder examination that is unremarkable while the pain is real

When it is both, which is often

The two coexist frequently enough that treating one and declaring victory is a mistake. A stiff, degenerate cervical spine changes scapular mechanics; a scapula that no longer rotates properly overloads the cuff. Each drives the other, and a plan aimed at only one produces a partial result and a patient who concludes nothing works.

Where both are contributing, the useful question is which one is currently dominant — and a diagnostic block answers that far more reliably than another scan.

Why this gets missed so often

Because of symptom-based silos. The shoulder goes to a shoulder clinician, the neck to a spine clinician, and each competently treats their region. Nobody owns the question of which one is generating the pain, because there is no code for that question and no appointment funded to answer it.

The cost of that gap is borne entirely by the patient, usually in the form of two or three procedures aimed at whichever structure the first scan happened to describe.

How we sort it out

• An examination that loads each region independently — the arm with the neck still, the neck with the arm still.
• A neurological screen, because dermatomal and myotomal findings settle it quickly.
• Ultrasound of the shoulder, in the room, which distinguishes a degenerate tendon from a partial tear from a tendon that is intact while something else generates the pain.
• Your imaging read against the examination rather than in place of it.
• A diagnostic block where the two remain genuinely ambiguous.

Why the terrain shows up in this question too

Both structures fail faster in the same conditions, which is part of why they so often present together. Diabetes is among the strongest predictors of rotator cuff tendinopathy, of poorer healing after cuff repair, and of adhesive capsulitis. Metainflammation keeps cervical facet synovium and cuff tendon alike in a degradative state. Glycated collagen is stiffer and fails at lower strain wherever it is.

So a fifty-eight-year-old with a stiff neck, a sore shoulder and an A1C nobody has mentioned does not have two coincidental problems. They have one systemic process with two expressions, and treating either one in isolation addresses a fraction of it.

Why a pain clinic asks to see your bloodwork.

What we do about the answer

If it is the shoulder, the tendon pages set out what is reasonable and what is not. If it is the neck, a confirmed facet level or a tethered root has its own treatment. If it is both — which it frequently is — we sequence rather than treat everything at once, because treating two things simultaneously means learning nothing from either.

And if the honest answer is that a supervised loading program addressing scapular control would do more for you than anything in a syringe, that is what you will be told. It costs less and for this particular pair of problems it is frequently the better spend.

Sorting out which one it is

Can a neck problem really cause shoulder pain?

Yes, commonly — C5 and C6 refer directly into the shoulder girdle. Cervical facet referral.

My MRI shows a rotator cuff tear. Isn’t that the answer?

Not necessarily. Tears are common in pain-free shoulders. Rotator cuff tendinopathy.

What does numbness in my hand mean?

It points away from the shoulder and toward the neck. Cervical problems.

Can you treat both?

Yes, but in an order decided by which is dominant, not both at once on spec. How we assess.

One practical note before you book either way. If both are contributing — and in a meaningful share of people past fifty, both are — then the order of treatment matters more than the choice between them. Treating the shoulder while an irritated cervical root keeps referring pain into it produces a shoulder that was correctly treated and still hurts, which then gets recorded as a treatment failure and colors every decision after it. Establishing which one dominates, and treating that first, is not a delay. It is what stops the second treatment being blamed for the first one being mistimed.

Related reading

• After a car accident
• Rotator cuff tendinopathy
• PRP for facet joints
• Hip, SI joint or lumbar spine?
• Failed neck surgery

A short self-check before you book

None of this replaces an examination, but it will tell you which page to read next.

• Sit still and turn your head slowly, side to side, then look up. If that reproduces the arm pain without moving the arm, the neck is involved.
• Keep your neck still and lift the arm. If that reproduces it and neck movement did not, the shoulder is the better bet.
• Put the palm of the painful side on top of your head. If the arm pain eases, that is the shoulder abduction relief sign and it points at a cervical root.
• Note where it stops. Pain ending around the elbow suggests shoulder; pain into the forearm or hand, especially with numbness, suggests neck.

If both tests reproduce it, that is useful information rather than a failed experiment — it means both are contributing, which is common and changes the order of treatment rather than ruling anything out. What the assessment adds.